fix scoping around await blocks

src/compile/nodes/AwaitBlock.ts

@@ -17,13 +17,12 @@ export default class AwaitBlock extends Node {
 		super(component, parent, scope, info);
 
 		this.expression = new Expression(component, this, scope, info.expression);
-		const deps = this.expression.dependencies;
 
 		this.value = info.value;
 		this.error = info.error;
 
 		this.pending = new PendingBlock(component, this, scope, info.pending);
-		this.then = new ThenBlock(component, this, scope.add(this.value, deps), info.then);
+		this.then = new ThenBlock(component, this, scope, info.then);
-		this.catch = new CatchBlock(component, this, scope.add(this.error, deps), info.catch);
+		this.catch = new CatchBlock(component, this, scope, info.catch);
 	}
 }

src/compile/nodes/CatchBlock.ts

@@ -1,14 +1,19 @@
 import Node from './shared/Node';
 import Block from '../render-dom/Block';
 import mapChildren from './shared/mapChildren';
+import TemplateScope from './shared/TemplateScope';
 
 export default class CatchBlock extends Node {
 	block: Block;
+	scope: TemplateScope;
 	children: Node[];
 
 	constructor(component, parent, scope, info) {
 		super(component, parent, scope, info);
-		this.children = mapChildren(component, parent, scope, info.children);
+
+		this.scope = scope.child();
+		this.scope.add(parent.error, parent.expression.dependencies);
+		this.children = mapChildren(component, parent, this.scope, info.children);
 
 		this.warnIfEmptyBlock();
 	}

src/compile/nodes/ThenBlock.ts

@@ -1,14 +1,19 @@
 import Node from './shared/Node';
 import Block from '../render-dom/Block';
 import mapChildren from './shared/mapChildren';
+import TemplateScope from './shared/TemplateScope';
 
 export default class ThenBlock extends Node {
 	block: Block;
+	scope: TemplateScope;
 	children: Node[];
 
 	constructor(component, parent, scope, info) {
 		super(component, parent, scope, info);
-		this.children = mapChildren(component, parent, scope, info.children);
+
+		this.scope = scope.child();
+		this.scope.add(parent.value, parent.expression.dependencies);
+		this.children = mapChildren(component, parent, this.scope, info.children);
 
 		this.warnIfEmptyBlock();
 	}

src/compile/nodes/shared/Expression.ts

@@ -109,10 +109,7 @@ export default class Expression {
 				if (isReference(node, parent)) {
 					const { name, nodes } = flattenReference(node);
 
-					if (currentScope.has(name)) {
+					if (currentScope.has(name)) return;
-						contextual_dependencies.add(name);
-						return;
-					}
 
 					expression.usesContext = true;
 
@@ -124,6 +121,8 @@ export default class Expression {
 					}
 
 					if (scope.names.has(name)) {
+						contextual_dependencies.add(name);
+
 						scope.dependenciesForName.get(name).forEach(dependency => {
 							dependencies.add(dependency);
 						});